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x in (-oo:+oo)
(4*x)/a+(3*x)/c = b // - b
(4*x)/a-b+(3*x)/c = 0
3*c^-1*x-b = 0 // + b
3*c^-1*x = b // : 3*c^-1
x = b/(3*c^-1)
x = b/(3*c^-1)
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